I have just upgraded my old computer with an additional graphics card (SLI setup) and a new case. Before I upgraded the computer ran just fine. Now when I turn the computer on it runs for only about a second (fans and lights turn on) and then turns off. Everything is plugged in correctly and I have double checked numerous times. I am almost positive it is a short. I have tested my power supply and am getting power from everything so I don't think it is the PSU. I have tried to insulate all the screw holes on the bother board by putting electrical tape on both sides of the holes to see if the short was being caused from the mother board shorting on the case; however this did not help either. Any suggestions?